Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o resultado da Copa Libertadores de 1999 para o time Vasco, que participou da fase de grupos na Copa Mercosul de 1999?
 ###Tabelas: CREATE TABLE brazilian_clubs_in_international_competitions (brazilian_clubs_in_international_competitions_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Copa Libertadores 1999 VARCHAR, Copa Mercosur 1999 VARCHAR, Copa CONMEBOL 1999 VARCHAR, Intercontinental Cup 1999 VARCHAR) CREATE TABLE homologs (homologs_id AUTO_INCREMENT PRIMARY KEY, Species VARCHAR, Species common name VARCHAR, NCBI Accession Number (mRNA/Protein) VARCHAR, Length (bp/aa) VARCHAR, Protein Identity VARCHAR) CREATE TABLE lpga_event (lpga_event_id AUTO_INCREMENT PRIMARY KEY, Year INT, Date VARCHAR, Venue VARCHAR, Champion VARCHAR, Country VARCHAR, Score INT, To par VARCHAR, Margin of victory VARCHAR, Purse ( $ ) INT, Winner's share ($) INT) CREATE TABLE current_women's_teams (current_women's_teams_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Nickname VARCHAR, Enrollment VARCHAR, Established INT) CREATE TABLE passages (passages_id AUTO_INCREMENT PRIMARY KEY, Incumbent VARCHAR, Reason for Vacancy VARCHAR, Appointed Successor VARCHAR, Date of Appointment VARCHAR, Elected Successor VARCHAR, Date of Election VARCHAR)  
SELECT Copa Libertadores 1999 FROM brazilian_clubs_in_international_competitions WHERE Copa Mercosur 1999 = group stage AND Team = vasco